FPGA-based solenoid valve driving module

Abstract

The invention discloses an FPGA-based solenoid valve driving module, which comprises a high-end switch, an FPGA unit, a low-end driving unit and a power supply, wherein the low-end driving unit comprises a plurality of low-end switches, a sampling resistor and a voltage comparator; a plurality of solenoid valves are the driving objects; the high-end switch is respectively connected to each solenoid valve which is connected to a low-end switch; each low-end switch is grounded through the same sampling resistor; and the voltage comparator is respectively connected to the sampling resistor and the FPGA unit. The parameter of the FPGA is set according to the type of the driving valve so as to guide the FPGA to output a PWM signal corresponding and controlling the driving valve for controlling the size of a peak current and a valley current and the lasting time, therefore being fit for various solenoid valves. The voltage comparator is used for sampling the voltage of the sampling resistor and comparing the parameter with the preset parameter. The high-end switch is switched off when a short circuit or open circuit is detected, so as to protect the driving module.

Description

technical field [0001] The invention relates to an FPGA-based solenoid valve driving module, which belongs to the technical field of engine fuel injection. Background technique [0002] In modern engine technology, oil supply system technology is at the core. The quick opening and closing of the solenoid valve is the key to the oil supply system. [0003] The opening of the solenoid valve is realized by the control of the conduction drive module. When the drive module is turned on, the current passes through the electromagnetic coil to generate electromagnetic force, which overcomes the spring force to open the solenoid valve. When the drive module is disconnected, the iron core under the restoring force of the spring Reset and close the solenoid valve under action. Since the time of each injection of the fuel injection system is very short, the electromagnet must be able to generate a strong suction force in a short time to overcome the tension of the return spring. The ...

AI Technical Summary

Problems solved by technology

[0005] The existing high-end and low-end drive structure can realize the peak holding waveform current of the solenoid valve, but the control of the current in the drive module requires a single-chip microcomputer to sample the current in real time, and change the duty cycle of the control pulse according to the actual current to change the current. , so the workload of the software is heavy, it requires a higher frequency, the accuracy cannot be guaranteed, and it takes up more resources of the single-chip microcomputer. At the same time, this existing high-end and low-end mechanism drive structure can only be applied to a solenoid valve, which lacks versatility.

Moreover, this high-end and low-end drive structure cannot detect and protect faults, and it is easy to cause the phenomenon that the solenoid valve coil current is too large and the coil is burned, and the coil is short-circuited or the current rises too fast and the drive module is burned.

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